I run a 3 gal. on alcohol in the Malibu. I originally bought a 4 gal. but couldn't get it to fit next to the rad. frame and front fender well. If you're running gas 3 gal. will be big enough, but alcohol in the qtr. it's cutting it close, you'll probably use 1 1/2 to 2 gal. alcohol but less on gas if you drive it to the starting line and back to the pits after the run.
JMO
Zip.